21115525424446 has 32 divisors (see below), whose sum is σ = 33393184167168. Its totient is φ = 9993999079680.

The previous prime is 21115525424431. The next prime is 21115525424453. The reversal of 21115525424446 is 64442452551112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a junction number, because it is equal to n+sod(n) for n = 21115525424396 and 21115525424405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76264641 + ... + 76541011.

It is an arithmetic number, because the mean of its divisors is an integer number (1043537005224).

Almost surely, 2^{21115525424446} is an apocalyptic number.

21115525424446 is a deficient number, since it is larger than the sum of its proper divisors (12277658742722).

21115525424446 is a wasteful number, since it uses less digits than its factorization.

21115525424446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293616.

The product of its digits is 1536000, while the sum is 46.

Adding to 21115525424446 its reverse (64442452551112), we get a palindrome (85557977975558).

The spelling of 21115525424446 in words is "twenty-one trillion, one hundred fifteen billion, five hundred twenty-five million, four hundred twenty-four thousand, four hundred forty-six".